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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec4d9dbb88abebd613a7a079ad155fea9d5c3d1c4765b6a82c3f00c47ebdb53a' 
  AND token = 'MQNhJKXU5483oyXe3DpSUIqY5e3mm04KSr0gxrl8VJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}